It was a tight fit, and Soundwave would do his best to make it less difficult, trying not to tense around him as he pushed in. Calipers rippled around his spike, the younger mech's intakes hitching several times as it pressed in inch by inch.

When his seal snapped, there was a soft hic again, but he never told him to stop, shivering as it finally pressed into the back of his valve. A very strange, though not unwelcome feeling, to feel full like this. He didn't move back against him, still shivering, though the trills and gasps he was making was proof enough he didn't want it to end.